1 /* 2 * Helper macros to support writing architecture specific 3 * linker scripts. 4 * 5 * A minimal linker scripts has following content: 6 * [This is a sample, architectures may have special requiriements] 7 * 8 * OUTPUT_FORMAT(...) 9 * OUTPUT_ARCH(...) 10 * ENTRY(...) 11 * SECTIONS 12 * { 13 * . = START; 14 * __init_begin = .; 15 * HEAD_TEXT_SECTION 16 * INIT_TEXT_SECTION(PAGE_SIZE) 17 * INIT_DATA_SECTION(...) 18 * PERCPU_SECTION(CACHELINE_SIZE) 19 * __init_end = .; 20 * 21 * _stext = .; 22 * TEXT_SECTION = 0 23 * _etext = .; 24 * 25 * _sdata = .; 26 * RO_DATA(PAGE_SIZE) 27 * RW_DATA(...) 28 * _edata = .; 29 * 30 * EXCEPTION_TABLE(...) 31 * 32 * BSS_SECTION(0, 0, 0) 33 * _end = .; 34 * 35 * STABS_DEBUG 36 * DWARF_DEBUG 37 * ELF_DETAILS 38 * 39 * DISCARDS // must be the last 40 * } 41 * 42 * [__init_begin, __init_end] is the init section that may be freed after init 43 * // __init_begin and __init_end should be page aligned, so that we can 44 * // free the whole .init memory 45 * [_stext, _etext] is the text section 46 * [_sdata, _edata] is the data section 47 * 48 * Some of the included output section have their own set of constants. 49 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and 50 * [__nosave_begin, __nosave_end] for the nosave data 51 */ 52 53 #ifndef LOAD_OFFSET 54 #define LOAD_OFFSET 0 55 #endif 56 57 /* 58 * Only some architectures want to have the .notes segment visible in 59 * a separate PT_NOTE ELF Program Header. When this happens, it needs 60 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE 61 * Program Headers. In this case, though, the PT_LOAD needs to be made 62 * the default again so that all the following sections don't also end 63 * up in the PT_NOTE Program Header. 64 */ 65 #ifdef EMITS_PT_NOTE 66 #define NOTES_HEADERS :text :note 67 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text 68 #else 69 #define NOTES_HEADERS 70 #define NOTES_HEADERS_RESTORE 71 #endif 72 73 /* 74 * Some architectures have non-executable read-only exception tables. 75 * They can be added to the RO_DATA segment by specifying their desired 76 * alignment. 77 */ 78 #ifdef RO_EXCEPTION_TABLE_ALIGN 79 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) 80 #else 81 #define RO_EXCEPTION_TABLE 82 #endif 83 84 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 85 #define ALIGN_FUNCTION() . = ALIGN(8) 86 87 /* 88 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which 89 * generates .data.identifier sections, which need to be pulled in with 90 * .data. We don't want to pull in .data..other sections, which Linux 91 * has defined. Same for text and bss. 92 * 93 * With LTO_CLANG, the linker also splits sections by default, so we need 94 * these macros to combine the sections during the final link. 95 * 96 * RODATA_MAIN is not used because existing code already defines .rodata.x 97 * sections to be brought in with rodata. 98 */ 99 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG) 100 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 101 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L* 102 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 103 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* 104 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral* 105 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 106 #else 107 #define TEXT_MAIN .text 108 #define DATA_MAIN .data 109 #define SDATA_MAIN .sdata 110 #define RODATA_MAIN .rodata 111 #define BSS_MAIN .bss 112 #define SBSS_MAIN .sbss 113 #endif 114 115 /* 116 * GCC 4.5 and later have a 32 bytes section alignment for structures. 117 * Except GCC 4.9, that feels the need to align on 64 bytes. 118 */ 119 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9 120 #define STRUCT_ALIGNMENT 64 121 #else 122 #define STRUCT_ALIGNMENT 32 123 #endif 124 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 125 126 /* 127 * The order of the sched class addresses are important, as they are 128 * used to determine the order of the priority of each sched class in 129 * relation to each other. 130 */ 131 #define SCHED_DATA \ 132 STRUCT_ALIGN(); \ 133 __begin_sched_classes = .; \ 134 *(__idle_sched_class) \ 135 *(__fair_sched_class) \ 136 *(__rt_sched_class) \ 137 *(__dl_sched_class) \ 138 *(__stop_sched_class) \ 139 __end_sched_classes = .; 140 141 /* The actual configuration determine if the init/exit sections 142 * are handled as text/data or they can be discarded (which 143 * often happens at runtime) 144 */ 145 #ifdef CONFIG_HOTPLUG_CPU 146 #define CPU_KEEP(sec) *(.cpu##sec) 147 #define CPU_DISCARD(sec) 148 #else 149 #define CPU_KEEP(sec) 150 #define CPU_DISCARD(sec) *(.cpu##sec) 151 #endif 152 153 #if defined(CONFIG_MEMORY_HOTPLUG) 154 #define MEM_KEEP(sec) *(.mem##sec) 155 #define MEM_DISCARD(sec) 156 #else 157 #define MEM_KEEP(sec) 158 #define MEM_DISCARD(sec) *(.mem##sec) 159 #endif 160 161 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 162 /* 163 * The ftrace call sites are logged to a section whose name depends on the 164 * compiler option used. A given kernel image will only use one, AKA 165 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 166 * dependencies for FTRACE_CALLSITE_SECTION's definition. 167 * 168 * Need to also make ftrace_stub_graph point to ftrace_stub 169 * so that the same stub location may have different protocols 170 * and not mess up with C verifiers. 171 */ 172 #define MCOUNT_REC() . = ALIGN(8); \ 173 __start_mcount_loc = .; \ 174 KEEP(*(__mcount_loc)) \ 175 KEEP(*(__patchable_function_entries)) \ 176 __stop_mcount_loc = .; \ 177 ftrace_stub_graph = ftrace_stub; 178 #else 179 # ifdef CONFIG_FUNCTION_TRACER 180 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; 181 # else 182 # define MCOUNT_REC() 183 # endif 184 #endif 185 186 #ifdef CONFIG_TRACE_BRANCH_PROFILING 187 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 188 KEEP(*(_ftrace_annotated_branch)) \ 189 __stop_annotated_branch_profile = .; 190 #else 191 #define LIKELY_PROFILE() 192 #endif 193 194 #ifdef CONFIG_PROFILE_ALL_BRANCHES 195 #define BRANCH_PROFILE() __start_branch_profile = .; \ 196 KEEP(*(_ftrace_branch)) \ 197 __stop_branch_profile = .; 198 #else 199 #define BRANCH_PROFILE() 200 #endif 201 202 #ifdef CONFIG_KPROBES 203 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 204 __start_kprobe_blacklist = .; \ 205 KEEP(*(_kprobe_blacklist)) \ 206 __stop_kprobe_blacklist = .; 207 #else 208 #define KPROBE_BLACKLIST() 209 #endif 210 211 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 212 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 213 __start_error_injection_whitelist = .; \ 214 KEEP(*(_error_injection_whitelist)) \ 215 __stop_error_injection_whitelist = .; 216 #else 217 #define ERROR_INJECT_WHITELIST() 218 #endif 219 220 #ifdef CONFIG_EVENT_TRACING 221 #define FTRACE_EVENTS() . = ALIGN(8); \ 222 __start_ftrace_events = .; \ 223 KEEP(*(_ftrace_events)) \ 224 __stop_ftrace_events = .; \ 225 __start_ftrace_eval_maps = .; \ 226 KEEP(*(_ftrace_eval_map)) \ 227 __stop_ftrace_eval_maps = .; 228 #else 229 #define FTRACE_EVENTS() 230 #endif 231 232 #ifdef CONFIG_TRACING 233 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 234 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 235 __stop___trace_bprintk_fmt = .; 236 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 237 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 238 __stop___tracepoint_str = .; 239 #else 240 #define TRACE_PRINTKS() 241 #define TRACEPOINT_STR() 242 #endif 243 244 #ifdef CONFIG_FTRACE_SYSCALLS 245 #define TRACE_SYSCALLS() . = ALIGN(8); \ 246 __start_syscalls_metadata = .; \ 247 KEEP(*(__syscalls_metadata)) \ 248 __stop_syscalls_metadata = .; 249 #else 250 #define TRACE_SYSCALLS() 251 #endif 252 253 #ifdef CONFIG_BPF_EVENTS 254 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 255 __start__bpf_raw_tp = .; \ 256 KEEP(*(__bpf_raw_tp_map)) \ 257 __stop__bpf_raw_tp = .; 258 #else 259 #define BPF_RAW_TP() 260 #endif 261 262 #ifdef CONFIG_SERIAL_EARLYCON 263 #define EARLYCON_TABLE() . = ALIGN(8); \ 264 __earlycon_table = .; \ 265 KEEP(*(__earlycon_table)) \ 266 __earlycon_table_end = .; 267 #else 268 #define EARLYCON_TABLE() 269 #endif 270 271 #ifdef CONFIG_SECURITY 272 #define LSM_TABLE() . = ALIGN(8); \ 273 __start_lsm_info = .; \ 274 KEEP(*(.lsm_info.init)) \ 275 __end_lsm_info = .; 276 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 277 __start_early_lsm_info = .; \ 278 KEEP(*(.early_lsm_info.init)) \ 279 __end_early_lsm_info = .; 280 #else 281 #define LSM_TABLE() 282 #define EARLY_LSM_TABLE() 283 #endif 284 285 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 286 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 287 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 288 #define _OF_TABLE_0(name) 289 #define _OF_TABLE_1(name) \ 290 . = ALIGN(8); \ 291 __##name##_of_table = .; \ 292 KEEP(*(__##name##_of_table)) \ 293 KEEP(*(__##name##_of_table_end)) 294 295 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 296 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 297 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 298 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 299 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 300 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 301 302 #ifdef CONFIG_ACPI 303 #define ACPI_PROBE_TABLE(name) \ 304 . = ALIGN(8); \ 305 __##name##_acpi_probe_table = .; \ 306 KEEP(*(__##name##_acpi_probe_table)) \ 307 __##name##_acpi_probe_table_end = .; 308 #else 309 #define ACPI_PROBE_TABLE(name) 310 #endif 311 312 #ifdef CONFIG_THERMAL 313 #define THERMAL_TABLE(name) \ 314 . = ALIGN(8); \ 315 __##name##_thermal_table = .; \ 316 KEEP(*(__##name##_thermal_table)) \ 317 __##name##_thermal_table_end = .; 318 #else 319 #define THERMAL_TABLE(name) 320 #endif 321 322 #ifdef CONFIG_DTPM 323 #define DTPM_TABLE() \ 324 . = ALIGN(8); \ 325 __dtpm_table = .; \ 326 KEEP(*(__dtpm_table)) \ 327 __dtpm_table_end = .; 328 #else 329 #define DTPM_TABLE() 330 #endif 331 332 #define KERNEL_DTB() \ 333 STRUCT_ALIGN(); \ 334 __dtb_start = .; \ 335 KEEP(*(.dtb.init.rodata)) \ 336 __dtb_end = .; 337 338 /* 339 * .data section 340 */ 341 #define DATA_DATA \ 342 *(.xiptext) \ 343 *(DATA_MAIN) \ 344 *(.ref.data) \ 345 *(.data..shared_aligned) /* percpu related */ \ 346 MEM_KEEP(init.data*) \ 347 MEM_KEEP(exit.data*) \ 348 *(.data.unlikely) \ 349 __start_once = .; \ 350 *(.data.once) \ 351 __end_once = .; \ 352 STRUCT_ALIGN(); \ 353 *(__tracepoints) \ 354 /* implement dynamic printk debug */ \ 355 . = ALIGN(8); \ 356 __start___dyndbg = .; \ 357 KEEP(*(__dyndbg)) \ 358 __stop___dyndbg = .; \ 359 LIKELY_PROFILE() \ 360 BRANCH_PROFILE() \ 361 TRACE_PRINTKS() \ 362 BPF_RAW_TP() \ 363 TRACEPOINT_STR() 364 365 /* 366 * Data section helpers 367 */ 368 #define NOSAVE_DATA \ 369 . = ALIGN(PAGE_SIZE); \ 370 __nosave_begin = .; \ 371 *(.data..nosave) \ 372 . = ALIGN(PAGE_SIZE); \ 373 __nosave_end = .; 374 375 #define PAGE_ALIGNED_DATA(page_align) \ 376 . = ALIGN(page_align); \ 377 *(.data..page_aligned) \ 378 . = ALIGN(page_align); 379 380 #define READ_MOSTLY_DATA(align) \ 381 . = ALIGN(align); \ 382 *(.data..read_mostly) \ 383 . = ALIGN(align); 384 385 #define CACHELINE_ALIGNED_DATA(align) \ 386 . = ALIGN(align); \ 387 *(.data..cacheline_aligned) 388 389 #define INIT_TASK_DATA(align) \ 390 . = ALIGN(align); \ 391 __start_init_task = .; \ 392 init_thread_union = .; \ 393 init_stack = .; \ 394 KEEP(*(.data..init_task)) \ 395 KEEP(*(.data..init_thread_info)) \ 396 . = __start_init_task + THREAD_SIZE; \ 397 __end_init_task = .; 398 399 #define JUMP_TABLE_DATA \ 400 . = ALIGN(8); \ 401 __start___jump_table = .; \ 402 KEEP(*(__jump_table)) \ 403 __stop___jump_table = .; 404 405 #define STATIC_CALL_DATA \ 406 . = ALIGN(8); \ 407 __start_static_call_sites = .; \ 408 KEEP(*(.static_call_sites)) \ 409 __stop_static_call_sites = .; \ 410 __start_static_call_tramp_key = .; \ 411 KEEP(*(.static_call_tramp_key)) \ 412 __stop_static_call_tramp_key = .; 413 414 /* 415 * Allow architectures to handle ro_after_init data on their 416 * own by defining an empty RO_AFTER_INIT_DATA. 417 */ 418 #ifndef RO_AFTER_INIT_DATA 419 #define RO_AFTER_INIT_DATA \ 420 . = ALIGN(8); \ 421 __start_ro_after_init = .; \ 422 *(.data..ro_after_init) \ 423 JUMP_TABLE_DATA \ 424 STATIC_CALL_DATA \ 425 __end_ro_after_init = .; 426 #endif 427 428 /* 429 * Read only Data 430 */ 431 #define RO_DATA(align) \ 432 . = ALIGN((align)); \ 433 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 434 __start_rodata = .; \ 435 *(.rodata) *(.rodata.*) \ 436 SCHED_DATA \ 437 RO_AFTER_INIT_DATA /* Read only after init */ \ 438 . = ALIGN(8); \ 439 __start___tracepoints_ptrs = .; \ 440 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 441 __stop___tracepoints_ptrs = .; \ 442 *(__tracepoints_strings)/* Tracepoints: strings */ \ 443 } \ 444 \ 445 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 446 *(.rodata1) \ 447 } \ 448 \ 449 /* PCI quirks */ \ 450 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 451 __start_pci_fixups_early = .; \ 452 KEEP(*(.pci_fixup_early)) \ 453 __end_pci_fixups_early = .; \ 454 __start_pci_fixups_header = .; \ 455 KEEP(*(.pci_fixup_header)) \ 456 __end_pci_fixups_header = .; \ 457 __start_pci_fixups_final = .; \ 458 KEEP(*(.pci_fixup_final)) \ 459 __end_pci_fixups_final = .; \ 460 __start_pci_fixups_enable = .; \ 461 KEEP(*(.pci_fixup_enable)) \ 462 __end_pci_fixups_enable = .; \ 463 __start_pci_fixups_resume = .; \ 464 KEEP(*(.pci_fixup_resume)) \ 465 __end_pci_fixups_resume = .; \ 466 __start_pci_fixups_resume_early = .; \ 467 KEEP(*(.pci_fixup_resume_early)) \ 468 __end_pci_fixups_resume_early = .; \ 469 __start_pci_fixups_suspend = .; \ 470 KEEP(*(.pci_fixup_suspend)) \ 471 __end_pci_fixups_suspend = .; \ 472 __start_pci_fixups_suspend_late = .; \ 473 KEEP(*(.pci_fixup_suspend_late)) \ 474 __end_pci_fixups_suspend_late = .; \ 475 } \ 476 \ 477 /* Built-in firmware blobs */ \ 478 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 479 __start_builtin_fw = .; \ 480 KEEP(*(.builtin_fw)) \ 481 __end_builtin_fw = .; \ 482 } \ 483 \ 484 TRACEDATA \ 485 \ 486 /* Kernel symbol table: Normal symbols */ \ 487 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 488 __start___ksymtab = .; \ 489 KEEP(*(SORT(___ksymtab+*))) \ 490 __stop___ksymtab = .; \ 491 } \ 492 \ 493 /* Kernel symbol table: GPL-only symbols */ \ 494 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 495 __start___ksymtab_gpl = .; \ 496 KEEP(*(SORT(___ksymtab_gpl+*))) \ 497 __stop___ksymtab_gpl = .; \ 498 } \ 499 \ 500 /* Kernel symbol table: Normal symbols */ \ 501 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 502 __start___kcrctab = .; \ 503 KEEP(*(SORT(___kcrctab+*))) \ 504 __stop___kcrctab = .; \ 505 } \ 506 \ 507 /* Kernel symbol table: GPL-only symbols */ \ 508 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 509 __start___kcrctab_gpl = .; \ 510 KEEP(*(SORT(___kcrctab_gpl+*))) \ 511 __stop___kcrctab_gpl = .; \ 512 } \ 513 \ 514 /* Kernel symbol table: strings */ \ 515 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 516 *(__ksymtab_strings) \ 517 } \ 518 \ 519 /* __*init sections */ \ 520 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 521 *(.ref.rodata) \ 522 MEM_KEEP(init.rodata) \ 523 MEM_KEEP(exit.rodata) \ 524 } \ 525 \ 526 /* Built-in module parameters. */ \ 527 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 528 __start___param = .; \ 529 KEEP(*(__param)) \ 530 __stop___param = .; \ 531 } \ 532 \ 533 /* Built-in module versions. */ \ 534 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 535 __start___modver = .; \ 536 KEEP(*(__modver)) \ 537 __stop___modver = .; \ 538 } \ 539 \ 540 RO_EXCEPTION_TABLE \ 541 NOTES \ 542 BTF \ 543 \ 544 . = ALIGN((align)); \ 545 __end_rodata = .; 546 547 /* 548 * Non-instrumentable text section 549 */ 550 #define NOINSTR_TEXT \ 551 ALIGN_FUNCTION(); \ 552 __noinstr_text_start = .; \ 553 *(.noinstr.text) \ 554 __noinstr_text_end = .; 555 556 /* 557 * .text section. Map to function alignment to avoid address changes 558 * during second ld run in second ld pass when generating System.map 559 * 560 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 561 * code elimination is enabled, so these sections should be converted 562 * to use ".." first. 563 */ 564 #define TEXT_TEXT \ 565 ALIGN_FUNCTION(); \ 566 *(.text.hot .text.hot.*) \ 567 *(TEXT_MAIN .text.fixup) \ 568 *(.text.unlikely .text.unlikely.*) \ 569 *(.text.unknown .text.unknown.*) \ 570 NOINSTR_TEXT \ 571 *(.text..refcount) \ 572 *(.ref.text) \ 573 MEM_KEEP(init.text*) \ 574 MEM_KEEP(exit.text*) \ 575 576 577 /* sched.text is aling to function alignment to secure we have same 578 * address even at second ld pass when generating System.map */ 579 #define SCHED_TEXT \ 580 ALIGN_FUNCTION(); \ 581 __sched_text_start = .; \ 582 *(.sched.text) \ 583 __sched_text_end = .; 584 585 /* spinlock.text is aling to function alignment to secure we have same 586 * address even at second ld pass when generating System.map */ 587 #define LOCK_TEXT \ 588 ALIGN_FUNCTION(); \ 589 __lock_text_start = .; \ 590 *(.spinlock.text) \ 591 __lock_text_end = .; 592 593 #define CPUIDLE_TEXT \ 594 ALIGN_FUNCTION(); \ 595 __cpuidle_text_start = .; \ 596 *(.cpuidle.text) \ 597 __cpuidle_text_end = .; 598 599 #define KPROBES_TEXT \ 600 ALIGN_FUNCTION(); \ 601 __kprobes_text_start = .; \ 602 *(.kprobes.text) \ 603 __kprobes_text_end = .; 604 605 #define ENTRY_TEXT \ 606 ALIGN_FUNCTION(); \ 607 __entry_text_start = .; \ 608 *(.entry.text) \ 609 __entry_text_end = .; 610 611 #define IRQENTRY_TEXT \ 612 ALIGN_FUNCTION(); \ 613 __irqentry_text_start = .; \ 614 *(.irqentry.text) \ 615 __irqentry_text_end = .; 616 617 #define SOFTIRQENTRY_TEXT \ 618 ALIGN_FUNCTION(); \ 619 __softirqentry_text_start = .; \ 620 *(.softirqentry.text) \ 621 __softirqentry_text_end = .; 622 623 #define STATIC_CALL_TEXT \ 624 ALIGN_FUNCTION(); \ 625 __static_call_text_start = .; \ 626 *(.static_call.text) \ 627 __static_call_text_end = .; 628 629 /* Section used for early init (in .S files) */ 630 #define HEAD_TEXT KEEP(*(.head.text)) 631 632 #define HEAD_TEXT_SECTION \ 633 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 634 HEAD_TEXT \ 635 } 636 637 /* 638 * Exception table 639 */ 640 #define EXCEPTION_TABLE(align) \ 641 . = ALIGN(align); \ 642 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 643 __start___ex_table = .; \ 644 KEEP(*(__ex_table)) \ 645 __stop___ex_table = .; \ 646 } 647 648 /* 649 * .BTF 650 */ 651 #ifdef CONFIG_DEBUG_INFO_BTF 652 #define BTF \ 653 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 654 __start_BTF = .; \ 655 KEEP(*(.BTF)) \ 656 __stop_BTF = .; \ 657 } \ 658 . = ALIGN(4); \ 659 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 660 *(.BTF_ids) \ 661 } 662 #else 663 #define BTF 664 #endif 665 666 /* 667 * Init task 668 */ 669 #define INIT_TASK_DATA_SECTION(align) \ 670 . = ALIGN(align); \ 671 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 672 INIT_TASK_DATA(align) \ 673 } 674 675 #ifdef CONFIG_CONSTRUCTORS 676 #define KERNEL_CTORS() . = ALIGN(8); \ 677 __ctors_start = .; \ 678 KEEP(*(SORT(.ctors.*))) \ 679 KEEP(*(.ctors)) \ 680 KEEP(*(SORT(.init_array.*))) \ 681 KEEP(*(.init_array)) \ 682 __ctors_end = .; 683 #else 684 #define KERNEL_CTORS() 685 #endif 686 687 /* init and exit section handling */ 688 #define INIT_DATA \ 689 KEEP(*(SORT(___kentry+*))) \ 690 *(.init.data init.data.*) \ 691 MEM_DISCARD(init.data*) \ 692 KERNEL_CTORS() \ 693 MCOUNT_REC() \ 694 *(.init.rodata .init.rodata.*) \ 695 FTRACE_EVENTS() \ 696 TRACE_SYSCALLS() \ 697 KPROBE_BLACKLIST() \ 698 ERROR_INJECT_WHITELIST() \ 699 MEM_DISCARD(init.rodata) \ 700 CLK_OF_TABLES() \ 701 RESERVEDMEM_OF_TABLES() \ 702 TIMER_OF_TABLES() \ 703 CPU_METHOD_OF_TABLES() \ 704 CPUIDLE_METHOD_OF_TABLES() \ 705 KERNEL_DTB() \ 706 IRQCHIP_OF_MATCH_TABLE() \ 707 ACPI_PROBE_TABLE(irqchip) \ 708 ACPI_PROBE_TABLE(timer) \ 709 THERMAL_TABLE(governor) \ 710 DTPM_TABLE() \ 711 EARLYCON_TABLE() \ 712 LSM_TABLE() \ 713 EARLY_LSM_TABLE() \ 714 KUNIT_TABLE() 715 716 #define INIT_TEXT \ 717 *(.init.text .init.text.*) \ 718 *(.text.startup) \ 719 MEM_DISCARD(init.text*) 720 721 #define EXIT_DATA \ 722 *(.exit.data .exit.data.*) \ 723 *(.fini_array .fini_array.*) \ 724 *(.dtors .dtors.*) \ 725 MEM_DISCARD(exit.data*) \ 726 MEM_DISCARD(exit.rodata*) 727 728 #define EXIT_TEXT \ 729 *(.exit.text) \ 730 *(.text.exit) \ 731 MEM_DISCARD(exit.text) 732 733 #define EXIT_CALL \ 734 *(.exitcall.exit) 735 736 /* 737 * bss (Block Started by Symbol) - uninitialized data 738 * zeroed during startup 739 */ 740 #define SBSS(sbss_align) \ 741 . = ALIGN(sbss_align); \ 742 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 743 *(.dynsbss) \ 744 *(SBSS_MAIN) \ 745 *(.scommon) \ 746 } 747 748 /* 749 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 750 * sections to the front of bss. 751 */ 752 #ifndef BSS_FIRST_SECTIONS 753 #define BSS_FIRST_SECTIONS 754 #endif 755 756 #define BSS(bss_align) \ 757 . = ALIGN(bss_align); \ 758 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 759 BSS_FIRST_SECTIONS \ 760 . = ALIGN(PAGE_SIZE); \ 761 *(.bss..page_aligned) \ 762 . = ALIGN(PAGE_SIZE); \ 763 *(.dynbss) \ 764 *(BSS_MAIN) \ 765 *(COMMON) \ 766 } 767 768 /* 769 * DWARF debug sections. 770 * Symbols in the DWARF debugging sections are relative to 771 * the beginning of the section so we begin them at 0. 772 */ 773 #define DWARF_DEBUG \ 774 /* DWARF 1 */ \ 775 .debug 0 : { *(.debug) } \ 776 .line 0 : { *(.line) } \ 777 /* GNU DWARF 1 extensions */ \ 778 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 779 .debug_sfnames 0 : { *(.debug_sfnames) } \ 780 /* DWARF 1.1 and DWARF 2 */ \ 781 .debug_aranges 0 : { *(.debug_aranges) } \ 782 .debug_pubnames 0 : { *(.debug_pubnames) } \ 783 /* DWARF 2 */ \ 784 .debug_info 0 : { *(.debug_info \ 785 .gnu.linkonce.wi.*) } \ 786 .debug_abbrev 0 : { *(.debug_abbrev) } \ 787 .debug_line 0 : { *(.debug_line) } \ 788 .debug_frame 0 : { *(.debug_frame) } \ 789 .debug_str 0 : { *(.debug_str) } \ 790 .debug_loc 0 : { *(.debug_loc) } \ 791 .debug_macinfo 0 : { *(.debug_macinfo) } \ 792 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 793 /* DWARF 3 */ \ 794 .debug_ranges 0 : { *(.debug_ranges) } \ 795 /* SGI/MIPS DWARF 2 extensions */ \ 796 .debug_weaknames 0 : { *(.debug_weaknames) } \ 797 .debug_funcnames 0 : { *(.debug_funcnames) } \ 798 .debug_typenames 0 : { *(.debug_typenames) } \ 799 .debug_varnames 0 : { *(.debug_varnames) } \ 800 /* GNU DWARF 2 extensions */ \ 801 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 802 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 803 /* DWARF 4 */ \ 804 .debug_types 0 : { *(.debug_types) } \ 805 /* DWARF 5 */ \ 806 .debug_addr 0 : { *(.debug_addr) } \ 807 .debug_line_str 0 : { *(.debug_line_str) } \ 808 .debug_loclists 0 : { *(.debug_loclists) } \ 809 .debug_macro 0 : { *(.debug_macro) } \ 810 .debug_names 0 : { *(.debug_names) } \ 811 .debug_rnglists 0 : { *(.debug_rnglists) } \ 812 .debug_str_offsets 0 : { *(.debug_str_offsets) } 813 814 /* Stabs debugging sections. */ 815 #define STABS_DEBUG \ 816 .stab 0 : { *(.stab) } \ 817 .stabstr 0 : { *(.stabstr) } \ 818 .stab.excl 0 : { *(.stab.excl) } \ 819 .stab.exclstr 0 : { *(.stab.exclstr) } \ 820 .stab.index 0 : { *(.stab.index) } \ 821 .stab.indexstr 0 : { *(.stab.indexstr) } 822 823 /* Required sections not related to debugging. */ 824 #define ELF_DETAILS \ 825 .comment 0 : { *(.comment) } \ 826 .symtab 0 : { *(.symtab) } \ 827 .strtab 0 : { *(.strtab) } \ 828 .shstrtab 0 : { *(.shstrtab) } 829 830 #ifdef CONFIG_GENERIC_BUG 831 #define BUG_TABLE \ 832 . = ALIGN(8); \ 833 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 834 __start___bug_table = .; \ 835 KEEP(*(__bug_table)) \ 836 __stop___bug_table = .; \ 837 } 838 #else 839 #define BUG_TABLE 840 #endif 841 842 #ifdef CONFIG_UNWINDER_ORC 843 #define ORC_UNWIND_TABLE \ 844 . = ALIGN(4); \ 845 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 846 __start_orc_unwind_ip = .; \ 847 KEEP(*(.orc_unwind_ip)) \ 848 __stop_orc_unwind_ip = .; \ 849 } \ 850 . = ALIGN(2); \ 851 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 852 __start_orc_unwind = .; \ 853 KEEP(*(.orc_unwind)) \ 854 __stop_orc_unwind = .; \ 855 } \ 856 . = ALIGN(4); \ 857 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 858 orc_lookup = .; \ 859 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 860 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 861 orc_lookup_end = .; \ 862 } 863 #else 864 #define ORC_UNWIND_TABLE 865 #endif 866 867 #ifdef CONFIG_PM_TRACE 868 #define TRACEDATA \ 869 . = ALIGN(4); \ 870 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 871 __tracedata_start = .; \ 872 KEEP(*(.tracedata)) \ 873 __tracedata_end = .; \ 874 } 875 #else 876 #define TRACEDATA 877 #endif 878 879 #define NOTES \ 880 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 881 __start_notes = .; \ 882 KEEP(*(.note.*)) \ 883 __stop_notes = .; \ 884 } NOTES_HEADERS \ 885 NOTES_HEADERS_RESTORE 886 887 #define INIT_SETUP(initsetup_align) \ 888 . = ALIGN(initsetup_align); \ 889 __setup_start = .; \ 890 KEEP(*(.init.setup)) \ 891 __setup_end = .; 892 893 #define INIT_CALLS_LEVEL(level) \ 894 __initcall##level##_start = .; \ 895 KEEP(*(.initcall##level##.init)) \ 896 KEEP(*(.initcall##level##s.init)) \ 897 898 #define INIT_CALLS \ 899 __initcall_start = .; \ 900 KEEP(*(.initcallearly.init)) \ 901 INIT_CALLS_LEVEL(0) \ 902 INIT_CALLS_LEVEL(1) \ 903 INIT_CALLS_LEVEL(2) \ 904 INIT_CALLS_LEVEL(3) \ 905 INIT_CALLS_LEVEL(4) \ 906 INIT_CALLS_LEVEL(5) \ 907 INIT_CALLS_LEVEL(rootfs) \ 908 INIT_CALLS_LEVEL(6) \ 909 INIT_CALLS_LEVEL(7) \ 910 __initcall_end = .; 911 912 #define CON_INITCALL \ 913 __con_initcall_start = .; \ 914 KEEP(*(.con_initcall.init)) \ 915 __con_initcall_end = .; 916 917 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 918 #define KUNIT_TABLE() \ 919 . = ALIGN(8); \ 920 __kunit_suites_start = .; \ 921 KEEP(*(.kunit_test_suites)) \ 922 __kunit_suites_end = .; 923 924 #ifdef CONFIG_BLK_DEV_INITRD 925 #define INIT_RAM_FS \ 926 . = ALIGN(4); \ 927 __initramfs_start = .; \ 928 KEEP(*(.init.ramfs)) \ 929 . = ALIGN(8); \ 930 KEEP(*(.init.ramfs.info)) 931 #else 932 #define INIT_RAM_FS 933 #endif 934 935 /* 936 * Memory encryption operates on a page basis. Since we need to clear 937 * the memory encryption mask for this section, it needs to be aligned 938 * on a page boundary and be a page-size multiple in length. 939 * 940 * Note: We use a separate section so that only this section gets 941 * decrypted to avoid exposing more than we wish. 942 */ 943 #ifdef CONFIG_AMD_MEM_ENCRYPT 944 #define PERCPU_DECRYPTED_SECTION \ 945 . = ALIGN(PAGE_SIZE); \ 946 *(.data..percpu..decrypted) \ 947 . = ALIGN(PAGE_SIZE); 948 #else 949 #define PERCPU_DECRYPTED_SECTION 950 #endif 951 952 953 /* 954 * Default discarded sections. 955 * 956 * Some archs want to discard exit text/data at runtime rather than 957 * link time due to cross-section references such as alt instructions, 958 * bug table, eh_frame, etc. DISCARDS must be the last of output 959 * section definitions so that such archs put those in earlier section 960 * definitions. 961 */ 962 #ifdef RUNTIME_DISCARD_EXIT 963 #define EXIT_DISCARDS 964 #else 965 #define EXIT_DISCARDS \ 966 EXIT_TEXT \ 967 EXIT_DATA 968 #endif 969 970 /* 971 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 972 * -fsanitize=thread produce unwanted sections (.eh_frame 973 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 974 * keep any .init_array.* sections. 975 * https://bugs.llvm.org/show_bug.cgi?id=46478 976 */ 977 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 978 # ifdef CONFIG_CONSTRUCTORS 979 # define SANITIZER_DISCARDS \ 980 *(.eh_frame) 981 # else 982 # define SANITIZER_DISCARDS \ 983 *(.init_array) *(.init_array.*) \ 984 *(.eh_frame) 985 # endif 986 #else 987 # define SANITIZER_DISCARDS 988 #endif 989 990 #define COMMON_DISCARDS \ 991 SANITIZER_DISCARDS \ 992 *(.discard) \ 993 *(.discard.*) \ 994 *(.modinfo) \ 995 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 996 *(.gnu.version*) \ 997 998 #define DISCARDS \ 999 /DISCARD/ : { \ 1000 EXIT_DISCARDS \ 1001 EXIT_CALL \ 1002 COMMON_DISCARDS \ 1003 } 1004 1005 /** 1006 * PERCPU_INPUT - the percpu input sections 1007 * @cacheline: cacheline size 1008 * 1009 * The core percpu section names and core symbols which do not rely 1010 * directly upon load addresses. 1011 * 1012 * @cacheline is used to align subsections to avoid false cacheline 1013 * sharing between subsections for different purposes. 1014 */ 1015 #define PERCPU_INPUT(cacheline) \ 1016 __per_cpu_start = .; \ 1017 *(.data..percpu..first) \ 1018 . = ALIGN(PAGE_SIZE); \ 1019 *(.data..percpu..page_aligned) \ 1020 . = ALIGN(cacheline); \ 1021 *(.data..percpu..read_mostly) \ 1022 . = ALIGN(cacheline); \ 1023 *(.data..percpu) \ 1024 *(.data..percpu..shared_aligned) \ 1025 PERCPU_DECRYPTED_SECTION \ 1026 __per_cpu_end = .; 1027 1028 /** 1029 * PERCPU_VADDR - define output section for percpu area 1030 * @cacheline: cacheline size 1031 * @vaddr: explicit base address (optional) 1032 * @phdr: destination PHDR (optional) 1033 * 1034 * Macro which expands to output section for percpu area. 1035 * 1036 * @cacheline is used to align subsections to avoid false cacheline 1037 * sharing between subsections for different purposes. 1038 * 1039 * If @vaddr is not blank, it specifies explicit base address and all 1040 * percpu symbols will be offset from the given address. If blank, 1041 * @vaddr always equals @laddr + LOAD_OFFSET. 1042 * 1043 * @phdr defines the output PHDR to use if not blank. Be warned that 1044 * output PHDR is sticky. If @phdr is specified, the next output 1045 * section in the linker script will go there too. @phdr should have 1046 * a leading colon. 1047 * 1048 * Note that this macros defines __per_cpu_load as an absolute symbol. 1049 * If there is no need to put the percpu section at a predetermined 1050 * address, use PERCPU_SECTION. 1051 */ 1052 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1053 __per_cpu_load = .; \ 1054 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1055 PERCPU_INPUT(cacheline) \ 1056 } phdr \ 1057 . = __per_cpu_load + SIZEOF(.data..percpu); 1058 1059 /** 1060 * PERCPU_SECTION - define output section for percpu area, simple version 1061 * @cacheline: cacheline size 1062 * 1063 * Align to PAGE_SIZE and outputs output section for percpu area. This 1064 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1065 * __per_cpu_start will be identical. 1066 * 1067 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1068 * except that __per_cpu_load is defined as a relative symbol against 1069 * .data..percpu which is required for relocatable x86_32 configuration. 1070 */ 1071 #define PERCPU_SECTION(cacheline) \ 1072 . = ALIGN(PAGE_SIZE); \ 1073 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1074 __per_cpu_load = .; \ 1075 PERCPU_INPUT(cacheline) \ 1076 } 1077 1078 1079 /* 1080 * Definition of the high level *_SECTION macros 1081 * They will fit only a subset of the architectures 1082 */ 1083 1084 1085 /* 1086 * Writeable data. 1087 * All sections are combined in a single .data section. 1088 * The sections following CONSTRUCTORS are arranged so their 1089 * typical alignment matches. 1090 * A cacheline is typical/always less than a PAGE_SIZE so 1091 * the sections that has this restriction (or similar) 1092 * is located before the ones requiring PAGE_SIZE alignment. 1093 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1094 * matches the requirement of PAGE_ALIGNED_DATA. 1095 * 1096 * use 0 as page_align if page_aligned data is not used */ 1097 #define RW_DATA(cacheline, pagealigned, inittask) \ 1098 . = ALIGN(PAGE_SIZE); \ 1099 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1100 INIT_TASK_DATA(inittask) \ 1101 NOSAVE_DATA \ 1102 PAGE_ALIGNED_DATA(pagealigned) \ 1103 CACHELINE_ALIGNED_DATA(cacheline) \ 1104 READ_MOSTLY_DATA(cacheline) \ 1105 DATA_DATA \ 1106 CONSTRUCTORS \ 1107 } \ 1108 BUG_TABLE \ 1109 1110 #define INIT_TEXT_SECTION(inittext_align) \ 1111 . = ALIGN(inittext_align); \ 1112 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1113 _sinittext = .; \ 1114 INIT_TEXT \ 1115 _einittext = .; \ 1116 } 1117 1118 #define INIT_DATA_SECTION(initsetup_align) \ 1119 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1120 INIT_DATA \ 1121 INIT_SETUP(initsetup_align) \ 1122 INIT_CALLS \ 1123 CON_INITCALL \ 1124 INIT_RAM_FS \ 1125 } 1126 1127 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1128 . = ALIGN(sbss_align); \ 1129 __bss_start = .; \ 1130 SBSS(sbss_align) \ 1131 BSS(bss_align) \ 1132 . = ALIGN(stop_align); \ 1133 __bss_stop = .; 1134